55566780 has 24 divisors (see below), whose sum is σ = 155587152. Its totient is φ = 14817792.

The previous prime is 55566751. The next prime is 55566799. The reversal of 55566780 is 8766555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462997 + ... + 463116.

It is an arithmetic number, because the mean of its divisors is an integer number (6482798).

Almost surely, 2^55566780 is an apocalyptic number.

It is an amenable number.

55566780 is an abundant number, since it is smaller than the sum of its proper divisors (100020372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55566780 is a wasteful number, since it uses less digits than its factorization.

55566780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926125 (or 926123 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The square root of 55566780 is about 7454.3128455948. The cubic root of 55566780 is about 381.5971100168.

The spelling of 55566780 in words is "fifty-five million, five hundred sixty-six thousand, seven hundred eighty".